If we use the Doppler method to measure the period with which a star alternately moves toward and away from us due to an orbiting planet, then we also know the
A) orbital period of the planet.
B) mass of the planet.
C) distance to the star.
D) radius of the planet.
A) orbital period of the planet.
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A giant star radiates energy at the rate of 3.0 × 1030 W, and its surface temperature has been measured to be 3000 K. Assuming that it is a perfect emitter, what is the radius of this star? (? = 5.67 × 10-8 W/m2 ? K4)
A) 7.8 × 1010 m B) 8.7 × 1010 m C) 1.4 × 1010 m D) 1.9 × 1011 m E) 2.3 × 1011 m
A -3.0-?C point charge and a -9.0-?C point charge are initially extremely far apart
How much work does it take to bring the -3.0-?C charge to x = 3.0 mm, y = 0.00 mm and the -9.0-?C charge to x = -3.0 mm, y = 0.00 mm? (k = 1/4??0 = 8.99 × 109 N • m2/C2) A) 40 J B) 81 J C) 27 J D) 6.8 J
The air in a tube open at both ends is sent into its fundamental resonance. One end of the tube is then closed and the air column is again set into its fundamental resonance. The resonant frequency ____ after the end is closed
a. halves b. stays the same c. doubles d. increases by a factor of 1.4
A rad is that amount of radiation that:
a. is also known as a rem. b. deposits 10–2 J of energy into 1 kg of absorbing material. c. deposits 8.76 × 10^–3 J of energy into 1 kg of air. d. produces 2.08 × 10^9 ion pairs per cm3 in air under standard conditions.